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[v5,3/3] PCI/IOV: Add pci_vf_drivers_autoprobe() interface

Message ID 20171109140035.64975-4-bryantly@linux.vnet.ibm.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Bryant G. Ly Nov. 9, 2017, 2 p.m. UTC 
Add a pci_vf_drivers_autoprobe() interface.  Setting autoprobe to false
on the PF prevents drivers from binding to VFs when they are enabled.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Juan J. Alvarez <jjalvare@linux.vnet.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
 arch/powerpc/platforms/pseries/pci.c |  2 ++
 drivers/pci/iov.c                    | 11 +++++++++++
 include/linux/pci.h                  |  2 ++
 3 files changed, 15 insertions(+)
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Patch

diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
index 14a90cf471cc..48d3af026f90 100644
--- a/arch/powerpc/platforms/pseries/pci.c
+++ b/arch/powerpc/platforms/pseries/pci.c
@@ -63,6 +63,7 @@  int pseries_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 {
 	/* Allocate PCI data */
 	add_dev_pci_data(pdev);
+	pci_vf_drivers_autoprobe(pdev, false);
 	return 0;
 }
 
@@ -70,6 +71,7 @@  int pseries_pcibios_sriov_disable(struct pci_dev *pdev)
 {
 	/* Release PCI data */
 	remove_dev_pci_data(pdev);
+	pci_vf_drivers_autoprobe(pdev, true);
 	return 0;
 }
 #endif
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index ac41c8be9200..1440e48094f4 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -634,6 +634,17 @@  void pci_restore_iov_state(struct pci_dev *dev)
 }
 
 /**
+ * pci_vf_drivers_autoprobe - set PF property drivers_autoprobe for VFs
+ * @dev: the PCI device
+ * @auto_probe: set VF drivers auto probe flag
+ */
+void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool auto_probe)
+{
+	if (dev->is_physfn)
+		dev->sriov->drivers_autoprobe = auto_probe;
+}
+
+/**
  * pci_iov_bus_range - find bus range used by Virtual Function
  * @bus: the PCI bus
  *
diff --git a/include/linux/pci.h b/include/linux/pci.h
index f4f8ee5a7362..17a08554baa2 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1965,6 +1965,7 @@  int pci_vfs_assigned(struct pci_dev *dev);
 int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
 int pci_sriov_get_totalvfs(struct pci_dev *dev);
 resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno);
+void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe);
 #else
 static inline int pci_iov_virtfn_bus(struct pci_dev *dev, int id)
 {
@@ -1992,6 +1993,7 @@  static inline int pci_sriov_get_totalvfs(struct pci_dev *dev)
 { return 0; }
 static inline resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
 { return 0; }
+static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { }
 #endif
 
 #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)